Sink



FIG. 1 is a top, front and left side elevation perspective view of the sink;

FIG. 2 is front view of the sink;

FIG. 3 is a top plan view of the sink;

FIG. 4 is a bottom view of the sink;

FIG. 5 is a rear view of the sink;

FIG. 6 is a left side elevation view of the sink; and,

FIG. 7 is a right side elevation view of the sink. 

CLAIM I claim the ornamental design for a sink, as shown and described. 